// script.aculo.us builder.js v1.8.1, Thu Jan 03 22:07:12 -0500 2008

// Copyright (c) 2005-2007 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
//
// script.aculo.us is freely distributable under the terms of an MIT-style license.
// For details, see the script.aculo.us web site: http://script.aculo.us/

var Builder = {
    NODEMAP: {
        AREA: 'map',
        CAPTION: 'table',
        COL: 'table',
        COLGROUP: 'table',
        LEGEND: 'fieldset',
        OPTGROUP: 'select',
        OPTION: 'select',
        PARAM: 'object',
        TBODY: 'table',
        TD: 'table',
        TFOOT: 'table',
        TH: 'table',
        THEAD: 'table',
        TR: 'table'
    },
    // note: For Firefox < 1.5, OPTION and OPTGROUP tags are currently broken,
    //       due to a Firefox bug
    node: function(elementName)
    {
        elementName = elementName.toUpperCase();
    
    // try innerHTML approach
        var parentTag = this.NODEMAP[elementName] || 'div';
        var parentElement = document.createElement(parentTag);
        try
        { // prevent IE "feature": http://dev.rubyonrails.org/ticket/2707
            parentElement.innerHTML = "<" + elementName + "></" + elementName + ">";
        }
        catch(e)
        {
        }
        var element = parentElement.firstChild || null;
      
    // see if browser added wrapping tags
        if (element && (element.tagName.toUpperCase() != elementName))
            element = element.getElementsByTagName(elementName)[0];
    
    // fallback to createElement approach
        if (!element) element = document.createElement(elementName);
    
    // abort if nothing could be created
        if (!element) return;

    // attributes (or text)
        if (arguments[1])
            if (this._isStringOrNumber(arguments[1]) || (arguments[1] instanceof Array) || arguments[1].tagName)
            {
                this._children(element, arguments[1]);
            }
            else
            {
                var attrs = this._attributes(arguments[1]);
                if (attrs.length)
                {
                    try
                    { // prevent IE "feature": http://dev.rubyonrails.org/ticket/2707
                        parentElement.innerHTML = "<" + elementName + " " + attrs + "></" + elementName + ">";
                    }
                    catch(e)
                    {
                    }
                    element = parentElement.firstChild || null;
            // workaround firefox 1.0.X bug
                    if (!element)
                    {
                        element = document.createElement(elementName);
                        for (attr in arguments[1])
                            element[attr == 'class' ? 'className' : attr] = arguments[1][attr];
                    }
                    if (element.tagName.toUpperCase() != elementName)
                        element = parentElement.getElementsByTagName(elementName)[0];
                }
            }

    // text, or array of children
        if (arguments[2])
            this._children(element, arguments[2]);

        return element;
    },
    _text: function(text)
    {
        return document.createTextNode(text);
    },

    ATTR_MAP: {
        'className': 'class',
        'htmlFor': 'for'
    },

    _attributes: function(attributes)
    {
        var attrs = [];
        for (attribute in attributes)
            attrs.push((attribute in this.ATTR_MAP ? this.ATTR_MAP[attribute] : attribute) + '="'
                    + attributes[attribute].toString().escapeHTML().gsub(/"/, '&quot;') + '"');
        return attrs.join(" ");
    },
    _children: function(element, children)
    {
        if (children.tagName)
        {
            element.appendChild(children);
            return;
        }
        if (typeof children == 'object')
        { // array can hold nodes and text
            children.flatten().each(function(e)
            {
                if (typeof e == 'object')
                    element.appendChild(e)
                else
                    if (Builder._isStringOrNumber(e))
                        element.appendChild(Builder._text(e));
            });
        }
        else
            if (Builder._isStringOrNumber(children))
                element.appendChild(Builder._text(children));
    },
    _isStringOrNumber: function(param)
    {
        return(typeof param == 'string' || typeof param == 'number');
    },
    build: function(html)
    {
        var element = this.node('div');
        $(element).update(html.strip());
        return element.down();
    },
    dump: function(scope)
    {
        if (typeof scope != 'object' && typeof scope != 'function') scope = window; //global scope

        var tags = ("A ABBR ACRONYM ADDRESS APPLET AREA B BASE BASEFONT BDO BIG BLOCKQUOTE BODY "
                + "BR BUTTON CAPTION CENTER CITE CODE COL COLGROUP DD DEL DFN DIR DIV DL DT EM FIELDSET "
                + "FONT FORM FRAME FRAMESET H1 H2 H3 H4 H5 H6 HEAD HR HTML I IFRAME IMG INPUT INS ISINDEX "
                + "KBD LABEL LEGEND LI LINK MAP MENU META NOFRAMES NOSCRIPT OBJECT OL OPTGROUP OPTION P "
                + "PARAM PRE Q S SAMP SCRIPT SELECT SMALL SPAN STRIKE STRONG STYLE SUB SUP TABLE TBODY TD "
                + "TEXTAREA TFOOT TH THEAD TITLE TR TT U UL VAR").split(/\s+/);

        tags.each(function(tag)
        {
            scope[tag] = function()
            {
                return Builder.node.apply(Builder, [tag].concat($A(arguments)));
            }
        });
    }
}
